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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecfba49c58647e83f37d612d868131247e7ef7788b5ea86c172955c188152cf' 
  AND token = 'f8B8AnDb2x6w7/J3e1Fvb+rEqOksLUyeLuHan3GqqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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