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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a209e1de4080a6bbbd060edfb90ced495597a7a7ad335b51bd6951b011ac19ac' 
  AND token = 'IiudkHJCFFw9BdvCpMJw/Zd9rIz83m58RJEkdPEpCkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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