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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b097af3f481236cee600c10a43c1e56e325978a8a27d57fd8c75d748ef007978' 
  AND token = 'h9Halh1FNjkx+p0K7EYdzhrv+Bplam0oHHZcbMHo7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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