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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c117b277689a62ae556b7d67aabf08a15d4c25d1d37fb0d7d1f3a8a124c08585' 
  AND token = 'mDRZomilsijpRf69SogMemda73nH5wbUTUt5e++j++s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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