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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f48928c29333d7439ed4ba4426f43de3953419d0b3ab5a31c0dc3f7fd660c0' 
  AND token = 'wmiM15E1n5xMN/RoP8WfqdtRf4OX5wxCA5JDc43aqf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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