SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84115b0544dc82a3db36088c3869669b8c0576440939c10f90e4ccf4457fad1' 
  AND token = 'ojijhwvAuVfrrJp1+KHBAwWaOPzE1ez0BkGtknazMqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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