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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f4186e3d9ad39afdb144517d3860713619993fd1c8d05bde7b43375a784ce0' 
  AND token = 'sbvV0nm9A8QUGpv2tKALIF0FEW+BY+ynFaLsZQOSW3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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