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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d3924ec7b478b649e937420d9b857a18d8efac66ae23646f42661135d04113' 
  AND token = 'b/Y+dhIwK3Iz0phOl5iPQhI6+tDc0gwo8cWbQPFdOGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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