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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37791f0e30096d158255c58237ab6eac4bb7c213d8033b0e66a35878ec62cb27' 
  AND token = 'FoZWakkcUfkQkLuouAm0Q5L8th5Cn7+pTBnZt4B8sBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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