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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eede2ed0218d7e255e8e0a90b281a707321149ae07df28b390482d63f1441705' 
  AND token = 'UdhWpJSrsw6f3VgFZJ8Had6ru2stBDC2G0sEAtGtw68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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