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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1220f3ec29a08deddc2ece49ae466ba26170b532c1b026bc9fa056e56cebbbd4' 
  AND token = 'bhFSyO3PHHDpon0cfckJ5N53UeJAFcpC/aMW+dDfqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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