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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d61390cf2432bb39dc2532407d56eba5ab2a6bce78f3580ee486d13c8224ff' 
  AND token = 'G8aJXuriF84nzo2yOqyvZgjGde1tD5BJmfA0sDAFGLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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