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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530f1b3769cee380816f70da37ccdd81ac288f9ed3a090fea8f92f2e55c94ded' 
  AND token = 'ggqOuC4fFDbpOsRuKwc/hHoUlQthuH32w/FzWPl+tpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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