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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82e89ad8c344f564bbfa0b010e0d5980fa594d0eccbe7809acc0477cab9dd94' 
  AND token = 'W41kaYsORZ8BmS8tvNvP3gINhX3n0uKROXmovwDhO98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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