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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5f835d2ba9382cc1f7ff1b82460b33c8422a51a88e0e0ca277e0703fc2ce92' 
  AND token = 't4vyhVZVVKfz6ypD4geoilw8s8VIOAJ9VG+O4WkhA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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