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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69a3d5f7bf04498d60213cc5013c2417d97ae4eacd6fc790e5df881a291f1c9' 
  AND token = 'jJ2PQBJnlxa9CxICC0F9BLJJJJ86JJL57uFwGrPmtGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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