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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63d8d820b0917f81b08ce717276d2ed9a51c39f7c7f254b81abb98864efedd8' 
  AND token = 'R0CxWzkmJwesLt3y3ufMJqnXhN+pcbLDlOvoZbw+AY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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