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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bbb53ba21cf3d6b50642b0039a218c7bb30c14fb054e9f9b5bb33c83eab949' 
  AND token = 'Gmk5hS7cbUOCsn1Jvu92c/gT+i/omkBt8i5xz3V8PUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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