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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4823cd8fcf05e749ab99628cb4718460d5f9211a8903495ff49e8f227cec3f7d' 
  AND token = 'eYFMG2qSJClKxs3WZ2JTc9S3RgMEP5QNSv5c3cr6uQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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