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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a9db3b02569e00cfe4d27248562281b69ade5e422f90b6cc1ed203a02672d6' 
  AND token = '2qUm9oTccII2RuRBs2RAulIMNxrDJuJvUWCzzkphOoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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