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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98935362df5841aa3af30b27c4e1c6b9a4372b6aa4b5ff05b817d60f0bf3ef3' 
  AND token = 'I4IFWvCE/QL0uK03Qu74oyL+YLO1M/hMSuPXfS/UqYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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