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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438e91aaa9f8eb1b317756d137a28a10df273ae03f0b16c94061b61860581c03' 
  AND token = 'qmeaOo4CpeopHlO+i52P7mP2LwZtxl3lGLxZp9RK2+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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