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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8547587c65e59aeb5b497f826c5485dea9c5c8e531beda4ebc7a696f5b996a97' 
  AND token = 'VvjYL8/wX6moU0u5B+cnQXhZy4885SiXMtJXTPC/5bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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