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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7bbbaee4414c7f828328d35e548cb3e7ffe1bb333adb4f5532038c421df855' 
  AND token = 'B6a+aVtx+dTIjLGYQDFwMHENuHBloQ+5pQTr6pPobfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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