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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8502582b72b762c0791c851149cb9522ce4894d7d0eb7e8fd6513a1c4e50d1ee' 
  AND token = 'bA2FD61n+dbod3ZPUcXtQ244RUJ6uReXZBI0snGDbg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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