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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544dfb77b51885545dd5a6a7827f44900a1d47571c037c1edb65387debb2ccb8' 
  AND token = '0SqhB85eALh8VrH9AvZmx4zplNKIqVSEjZFh5neKtSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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