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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b937c30ff17d8711c777da520589fb85d0b252b90ad6c210ffab9bc9e6377678' 
  AND token = 'uszRuhox8WjRU/fmrLaoE0WU0d4Z2kqrPFv4n4zl7us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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