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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44575f95bf0278d2be90d7aeb8fed82ca67563941434500a1d163ca76dd7996c' 
  AND token = 'yyheUFSSnMdewzLtYOlrEP5ZDV2N8KvQmZ6diUd4+PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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