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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068a006c7c057368e776817e6c501a071876099bac9a5fb1b7e0270f66db457d' 
  AND token = 'EyHc0MnsXHDvPcGgziEpmD0tTUer0R2tTA02EMdrE1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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