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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364e3e90c2f364e5df0a5b4ea9f687aa5978bac15d62483fa0659e4a533ece77' 
  AND token = 'Wm/ipnaZEkp+1hbxXhNYLHtR/mFEQRLPTkp3a1eS4bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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