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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92a84df9bc641c02e0f1b155dbfac50aebca80a5a20bb2555510095fb089d15' 
  AND token = 'KvmwHaexSxoKACj/uLlQQjDZvLX0O1cX8nG5cZRU1N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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