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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ca0942f790edae589b6135d56c033432b688cf1f8b159751be80e79bdb487c' 
  AND token = 'LngSAl6tDWG9R8r7rUo78MH4TgzaEMclz6wA1VsIBSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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