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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67dbbeb9c0abd01c111a9f3687d959c1c98d137bb90ce5bb314f7f9d2b760fe' 
  AND token = 'Zqv1O93bpTGJkI4s3+GsMpfhNsIo9qoSbf4E0WGAti0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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