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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b6bcd202b9ae4a24a62bba0d037a5045a9dd4ba21a9d7b8e96cf19884f0074' 
  AND token = '4M2/HNW0x51wzu5e4fKW7knyTzdtUEPX5VNfRFCoYHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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