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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81de282ab53f320acbdb494260ed39fadac9ea1466e8c2953e22bafae6568ae3' 
  AND token = 'jRq9Xu7gBGkBOq8zto9z8LQ+DDsDOI2A/USYeAdhEdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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