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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3c0fd6879cb68345ffe2c69b3ca5bed5ece403892ea71628303c86722f3da8' 
  AND token = 'ysZa16WSM+kgTY6RqOJDqNQirdhRE35UYOAx1z+UUZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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