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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283e2d5b6905bc68c2dd68ba77e277e9b5a42989399e9989aa45814a6eb2fbd5' 
  AND token = '3/smoQLmQhBxxYp4iD4hrHD/rWSUA9na8Df6Q4rK2rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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