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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0e97a3d0384df2bc42b1e5d8d227b258a033049c46bb49e4e7e4ae65e5f467' 
  AND token = 'CEVo3lx99xaqa828u3xAK3TyRQdw6wOFtpV4b9EHwC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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