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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd97cf4e1a869dc24c9c7e2bf9ba91ba11087dd8989b75028e999b89d2d457f' 
  AND token = 'y4r+hJpb1QfwpNMzZKZid2PcuE6o2EozkryeM136qYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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