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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b0bacdc3384ea11de0a32b82a963a67041cc617baa21323c57a2b8f9e1bf8' 
  AND token = 'LBYT4RDuXhL0H//wX2eS5aSOA5Kg2W0KmcTK6I5g3FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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