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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cba9b7dd538d74a144babab5e6da307a7224cbfda8897cfffc978a050765df' 
  AND token = '9j6++V0dCQXpm9WQydN9h223UGxy3KwBsvp2l3wNov0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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