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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a77f39fc1210f7328ac2faa90c19238a32f866b02e9899ca9a2e2567e417fd3' 
  AND token = 'Saiz6rnTNEM1YdepPySwnJD+DJhJpuxRK7rixVDQEPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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