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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c156abf240cd80819aecbbd8e7e6bcb2344590c2c61dfffec4ff20b55ab48a' 
  AND token = 'fcumcizN036tQtUK/qnGhrQtH2Sp9pFWMHyWMWt8dns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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