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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ff2a5d060210b08633e40b4100e331d9e559690af837667773f301d024c64f' 
  AND token = '8tAmLk7jUp5Qo/QamVFkeEKr8JI6Ge5S8Tnq5xMBzB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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