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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d256ae8e1ea2415a110d10788def0f3d91c6590730c04e07a26e3f5af88752' 
  AND token = 'IYH8YKf/eD6q9mmzafZKnEXBdY2IrwJzHSVGBGVq18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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