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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5767c4685d3a9d2f381be852d07d18be6e8d026742d891e3cdc085870035e1f6' 
  AND token = 'z4eY/bNBWB0kZe/UIUOXnHWVt0GQmSNiR7GQZr9sO1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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