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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a232fda59275d84fbf9f5d918b555016df7fcda26ee7ff258506646417ae317' 
  AND token = 'igHeoL8tHA0wH7r1cwgMwnzs2qzrJn/MXHTyb8l9zW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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