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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c212574b401813568b750979316277592c2e4e324fe13c85302cc75c6625b1' 
  AND token = 'C66IX9NSMzGdqVAw7w/LHsgM7ddycfkp6T3xSBnR2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}