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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a4fbf752f69c2e6fa83721ef0ce7cb531a5c918c951f2f0cc9bc62f39b79f5' 
  AND token = 'gpngdi0hZbY3anelf2mJsndyEdUzUdrenL6qviXFDCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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