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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cded7d373a047beb1732c2e2028e0f5219dcbebb2e8bbdfa4ebf15691a26391b' 
  AND token = '+WLBT1qHZn6V4RKmHSnHqLJF600LyLt2/5UG1cDlCMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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