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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91bface02276ae93bbe532c12a19cb88585c24fb18ae854ce7c29e9edca6c92' 
  AND token = '6DFZKcNfgQnHaQcKcrDL9umAgiFOT7gWZDZJZz2ANCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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