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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79704ee90bcdccd24aabf76d7f62f2dbfa509aadfcfd9dcafff116de26f864cc' 
  AND token = '6gym2R/+8bl7eeMSaxB1u3+s8Ljoj7Z8W+SHzO2XVYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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