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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0785344fe5b0884945a5aa21183d3771d4c41db9275ae752c7bcc580c82ec9c' 
  AND token = 'AfDggLk1fOBLeSKn6RV4tCr4eixR6ZYU9/zcaviuKio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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