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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf7e2cb1c35b4428cd8e60db0f8336d020e0551b3581b3b7ca873cb271f01c8' 
  AND token = 'HqJgCccT/BPZjBvNghumYy+PuJInRNwTS85QJU05FOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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