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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8967b5d4af2bed15cedb82676d5c8410fe9085af3491572489e2a54e0a3016ea' 
  AND token = 'zQnLYDk335Sd6D3GAGr/UA9Clvowi9a1Dgnjz167MgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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