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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9128be00f4b97d8e3cf04fa081ef1849a29a0d733e250e5d94bdf09f0029f7' 
  AND token = 'aUZrYkHGfIj7oxtt4KWXNvWLMsEvwAXeG8tgfVXXjNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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