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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bfd85a0a0da1ae89f4e8b46def40479333b88bd974cea5b9cf1695ab543847' 
  AND token = 'Rt/YGdmzXtunSKePIJbYWbahz8uh1cPoleWUlwQjGCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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