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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b7dc3de05ed0664d9da030b35cae5a54c499e58ae9b811738454dbd5f7c2aa' 
  AND token = '5hw7vMKPlUVxNE6sS4QXJQmn8w3zhEzrARvNbXdctmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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