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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400a8313cc1d15ad3026194ecfa4b62769677d71f06d3f3d848f44c97a82242c' 
  AND token = 'Au2q4WbArt5U/ct9t8ceGivZOQH1vrHaEjW6QtdJZ30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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