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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d05f8ede4c865408f132f6ef3556025bfc3dbd09cdcb9366cefecd5cd4f81d7' 
  AND token = '/94DbWhokQeJuHsI+Nff7Smk2uxVDz0gI8aHRzS5Jdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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