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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c2e60113b9adc9f5cefbffb4af00c9031658f36cd907a5bbc5c9ab50f7d11d' 
  AND token = 'miIrx0nRH5P1Q+W1bG8nZqt1wE1ZnUYJMbizC6YZVNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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