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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3b80a7dcf1fbd27c6af4b9a0ccb422e5752bf9d39f4d9bfc9ccaa489f0b02e' 
  AND token = 'FsRn+tGLHvIO3TiMWvBIn7IPg+1wU5H7sSmDfdH3jpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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