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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f4555e86670b2c28d649e5bb01d0edc707657ecc74b2a3fe0d85316565e905' 
  AND token = 'EATT1bMgZLDscVDYTXNonrU4YM3Gc2r7Sd9RsHcrX50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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