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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bd755312be196866ab5fb86aebf006881ab2420eb1a207bfcea84fa2569207' 
  AND token = 'LAelpo+niKwc7gGGihEEx+gvtcd1J2QIPM+BaoIKTCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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