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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a39e0ee722c0579300e22ba5aa7de9ff95250769f19d1b69462294dd7cf12b2' 
  AND token = 'lffl3gnHYL6s4z/M8KAJ85Mk3Y+CkKMIBaFODWAi9G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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