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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470ae9e8205d8dc9a077eda90ba0ae32bd5641a321ba28fc643ab52702098ad3' 
  AND token = 'xuZXagEc38/RXluAmfPIYFQU9GtY8RcQjD3bf5gz0gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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