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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73baa28510626fce51c6fee2edfa031917cb5edb94b2e9503f01dc70b3fc1f0' 
  AND token = 'tLoVJ2J1XpRXrcd/vw2/oVsf9llLZ/WnA8YCWP7OsE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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