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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd510915d8fb7ceceff32bb09147b4b2f947319eca87a058e015246c364329f39' 
  AND token = 'uZdz6Sy3CkR0H41e6KEsGDyiliv9XxVSTP+8COyneDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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