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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151acb09a4d9d075c8ce3b5bd9f79b39d2f975277a42e0e3b6909593df9a35f6' 
  AND token = 'B8Oyb95fwiVkH2dGPdegBE6ErpLMSG0CcslNxiAbrTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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