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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79453eebfc302f129fb9518471a1a6c0f71ac78f1d07938940a67f9fa4dfac56' 
  AND token = 'Qrdif8WQQHC3N8y7NtQpo0P+orJhc7H3meBqMiqShVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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