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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfde8b927d5b9e7db87ecb4482fb42cfdb76c1edd4275f849690a99eafa5da73' 
  AND token = '2v/LEs4nhn7EahGoHuEHNV4x2/bhS+q8vMK38MPtdV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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