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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9de404fabbe563e60f207bf390ac49c7803fa0ef6d89c0f93a775568662d111' 
  AND token = '2jzWG5QSqAKceWsc3e0SS55LnidYyCuX6i2Eu+FC6zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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