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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e33ea53c88c97fd7cb08c60e8eab7613d381d96caed075f62d99f8908b7a9c' 
  AND token = 'JNrE8t0HTbyM7PEulDF2XvgFw/AyJ8u6FomOngwmE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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